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import ffi, { cstr, decodeBase64 } from "./ffi.ts";
const {  sk_image_destroy,  sk_image_from_encoded,  sk_image_from_file,  sk_image_height,  sk_image_width,} = ffi;
const SK_IMAGE_FINALIZER = new FinalizationRegistry(  (image: Deno.PointerValue) => {    sk_image_destroy(image);  },);
export type ImageSource = Uint8Array | string;
const _token = Symbol("[[token]]");const _ptr = Symbol("[[ptr]]");const _src = Symbol("[[src]]");
export class Image extends EventTarget {  [_token]: { ptr: Deno.PointerValue } = { ptr: null };  [_ptr]: Deno.PointerValue = null;  [_src]?: ImageSource;
  get _unsafePointer(): Deno.PointerValue {    return this[_ptr];  }
  constructor(data?: ImageSource) {    super();    this.src = data;  }
  get src(): ImageSource | undefined {    return this[_src];  }
  set src(data: ImageSource | undefined) {    if (this[_ptr] !== null) {      sk_image_destroy(this[_ptr]);      SK_IMAGE_FINALIZER.unregister(this[_token]);      this[_ptr] = null;    }
    if (data === undefined) {      this[_src] = undefined;      this[_ptr] = null;      this[_token].ptr = null;      return;    }
    if (typeof data === "string") {      if (data.match(/^\s*https?:\/\//)) {        fetch(data.trim())          .then((res) => res.arrayBuffer())          .then((buffer) => {            this.src = new Uint8Array(buffer);          })          .catch((error) => {            this.dispatchEvent(              new ErrorEvent("error", {                error,              }),            );          });        return;      } else if (data.match(/^\s*data:/)) {        const comma = data.indexOf(",");        const isBase64 = data.lastIndexOf("base64", comma) !== -1;        const content = data.slice(comma + 1);        const buffer = isBase64          ? decodeBase64(content)          : new TextEncoder().encode(content);        this.src = buffer;        return;      }    }
    this[_ptr] = data instanceof Uint8Array      ? sk_image_from_encoded(data, data.byteLength)      : sk_image_from_file(cstr(data));
    if (this[_ptr] === null) {      const error = new Error("Failed to load image");      queueMicrotask(() => {        this.dispatchEvent(          new ErrorEvent("error", {            error,          }),        );      });      throw error;    }
    this[_token].ptr = this[_ptr];    this[_src] = data;
    if (this[_ptr] !== null) {      SK_IMAGE_FINALIZER.register(this, this[_ptr], this[_token]);    }
    queueMicrotask(() => {      this.dispatchEvent(new Event("load"));    });  }
  #onload?: EventListenerOrEventListenerObject;  #onerror?: EventListenerOrEventListenerObject;
  get onload(): EventListenerOrEventListenerObject | undefined {    return this.#onload;  }
  get onerror(): EventListenerOrEventListenerObject | undefined {    return this.#onerror;  }
  // deno-lint-ignore adjacent-overload-signatures  set onload(fn: EventListenerOrEventListenerObject | undefined) {    if (this.#onload) {      this.removeEventListener("load", this.#onload);    }    this.#onload = fn;    if (fn) this.addEventListener("load", fn);  }
  // deno-lint-ignore adjacent-overload-signatures  set onerror(fn: EventListenerOrEventListenerObject | undefined) {    if (this.#onerror) {      this.removeEventListener("error", this.#onerror);    }    this.#onerror = fn;    if (fn) this.addEventListener("error", fn);  }
  static async load(path: string | URL): Promise<Image> {    const data = path instanceof URL || path.startsWith("http")      ? await fetch(path).then((e) => e.arrayBuffer()).then((e) =>        new Uint8Array(e)      )      : await Deno.readFile(path);    return new Image(data);  }
  /**   * Load an image from a local file synchronously.   */  static loadSync(path: string): Image {    const data = Deno.readFileSync(path);    return new Image(data);  }
  get width(): number {    if (this._unsafePointer === null) return 0;    return sk_image_width(this[_ptr]);  }
  get height(): number {    if (this._unsafePointer === null) return 0;    return sk_image_height(this[_ptr]);  }
  [Symbol.for("Deno.customInspect")](): string {    if (this._unsafePointer === null) {      return `Image { pending, src: ${Deno.inspect(this.src)} }`;    }    return `Image { width: ${this.width}, height: ${this.height} }`;  }}
export type ColorSpace = "srgb" | "rec2020" | "display-p3";
export interface ImageDataSettings {  colorSpace?: ColorSpace;}
export class ImageData {  #width: number;  #height: number;  #data: Uint8ClampedArray;  #colorSpace: ColorSpace;
  constructor(width: number, height: number, settings?: ImageDataSettings);  constructor(    dataArray: Uint8ClampedArray | Uint8Array,    width: number,    height?: number,    settings?: ImageDataSettings,  );  constructor(    width: number | Uint8ClampedArray | Uint8Array,    height: number | ImageDataSettings,    settings?: ImageDataSettings | number,    settings2?: ImageDataSettings,  ) {    if (typeof width === "number") {      this.#width = width;      this.#height = height as number;      this.#data = new Uint8ClampedArray(width * (height as number) * 4);      this.#colorSpace = (settings as ImageDataSettings)?.colorSpace ?? "srgb";    } else {      this.#data = new Uint8ClampedArray(width.buffer);      this.#width = height as number;      this.#height = settings ? settings as number : this.#data.length / 4;      this.#colorSpace = settings2?.colorSpace ?? "srgb";    }  }
  get width(): number {    return this.#width;  }
  get height(): number {    return this.#height;  }
  get data(): Uint8ClampedArray {    return this.#data;  }
  get colorSpace(): ColorSpace {    return this.#colorSpace;  }}